familyBetulaceae
subfamilyBetulaceae subfam. Betuloideae
Difference between revisions of "Betulaceae subfam. Betuloideae"
Deut. Dendrol. 106, 1893 (as Betulae).
Treatment appears in FNA Volume 3.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Trunks </b>and branches terete. <b>Bark</b> thin, close or exfoliating in thin sheets, becoming thicker and frequently furrowed or broken in age; lenticels often present, prominent, sometimes becoming greatly expanded horizontally. <b>Bark</b> and wood strongly tanniferous. <b>Young</b> twigs and buds often covered with small to large, resinous glands; pith triangular in cross section. <b>Leaves</b> 3-ranked, occasionally nearly 2-ranked. <b>Staminate</b> flowers: perianth of 4(–6) sepals, well defined, minute, membranaceous. <b>Pistillate</b> flowers 2–3 per scale, scales arranged in conelike catkins; perianth not obvious; ovules with 1 integument. <b>Infructescences</b> 1–4 cm, conelike, composed of many scales; scales either persistent or deciduous with fruits, crowded, small, woody or leathery. <b>Fruits</b> tiny samaras, lateral wings 2, membranous, sometimes reduced to ridges; pericarp thin, leathery.</span><!-- |
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Revision as of 14:47, 27 July 2019
Trunks and branches terete. Bark thin, close or exfoliating in thin sheets, becoming thicker and frequently furrowed or broken in age; lenticels often present, prominent, sometimes becoming greatly expanded horizontally. Bark and wood strongly tanniferous. Young twigs and buds often covered with small to large, resinous glands; pith triangular in cross section. Leaves 3-ranked, occasionally nearly 2-ranked. Staminate flowers: perianth of 4(–6) sepals, well defined, minute, membranaceous. Pistillate flowers 2–3 per scale, scales arranged in conelike catkins; perianth not obvious; ovules with 1 integument. Infructescences 1–4 cm, conelike, composed of many scales; scales either persistent or deciduous with fruits, crowded, small, woody or leathery. Fruits tiny samaras, lateral wings 2, membranous, sometimes reduced to ridges; pericarp thin, leathery.
Distribution
Primarily boreal and cool temperate zones of Northern Hemisphere
Discussion
Genera 2, species 60 (2 genera, 26 species in the flora).
Selected References
None.